JPS5931201Y2 - Illumination device in endoscope - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an illumination device for a side-viewing endoscope.

In endoscopes, the means for illuminating the inside of the body cavity is carried out by a light-transmitting optical fiber bundle, but in side-viewing endoscopes, the means for bending light laterally is by light-transmitting optical fiber bundles. When a bundle of optical fibers is bent, as shown in Figure 1, the height of the bend increases, which increases the exclusive space inside the head of the endoscope, and the amount of light emitted from the tip decreases because light leaks outside from the bent part. It has fewer drawbacks.

Therefore, as shown in Figure 2, a right-angle prism is usually connected to the tip end of a straight optical fiber bundle for light transmission to bend the light, but according to this, the vignetting of the light by the prism causes As shown in FIG. 2, this method has the disadvantage that only the light in the middle of the optical fiber bundle for light transmission can be used, resulting in less diffused light.

Therefore, the purpose of this invention is to solve the above drawbacks.
The tip of the optical fiber bundle for light transmission is tilted so that the end surface of the optical fiber bundle for light transmission is aligned with the light entrance surface of a triangular deformed prism whose light entrance surface is tilted by the diffusion angle of the emitted diffused light or an angle close to it. It is characterized by widening the spread of light by forming and adhering it closely.

Next, an embodiment of the present invention will be described with reference to the drawings.

First, the principle of the present invention will be explained with reference to FIGS. 6I and II.

In order to capture the diffused light of the light transmitting optical fiber bundle 1, a tall prism 3 having a light incident surface wider than the end surface of the light transmitting optical fiber bundle 1 is used as shown in FIG. I have to throw it.

However, if this is done, the prism becomes large and takes up a large space, making it unsuitable for use as a prism to be housed within an endoscope.

However, this method has the advantage that the light from the end face of the optical fiber bundle 1 for light transmission can be converted into A and B lights by the prism and can all be used as illumination light.

This is the same as the light from A' to B when another prism is combined as shown by the dotted line.

Therefore, as shown in FIG.
A triangular deformed prism 2 is formed as a light incident surface PR so that its surface is aligned with the PR surface.

In other words, by tilting the light incident surface by the diffusion angle SPT of light emission, the angle TPR
The triangularly deformed prism 2 deformed by the amount of the triangular shape can be made into a low-height prism.

The end face of the light-transmitting optical fiber bundle 1 is formed obliquely in accordance with the light incident surface PR and brought into close contact with the light-transmitting optical fiber bundle 1.

With this configuration, the light emitted from the light transmitting optical fiber bundle 1 can be transmitted to the ranges A and B and can be used entirely as illumination light.

Therefore, as shown in FIGS. 3 and 4, when used in a side-viewing endoscope or a gastrocamera, the illumination device can be bright and have a wide illumination range.

Note that each of the above-mentioned angles indicates an optimum condition, and does not necessarily have to match the above-mentioned angle, but may be an angle close to it.

Further, as shown in FIG. 5, if the reflecting surface of the triangular deformed prism 20 is curved slightly inward or outward, the light from the light emitting surface can be spread out even more.

According to the present invention described above, the diffused light transmitted by the light transmitting optical fiber can be used as waste heat (waste heat). This has the advantage that the space occupied by the head of the endoscope can be reduced.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a conventional example, Fig. 2 is an explanatory diagram explaining the structure of the prism, Fig. 3 is a sectional view of the main part of the endoscope head of the present invention, and Fig. 4 is an explanatory diagram showing the main part of the endoscope head of the present invention. FIG. 5 is an explanatory diagram of an embodiment in which the reflecting surface of the prism is a curved surface, and FIGS. 6 I and II are explanatory diagrams illustrating the principle of the present invention. 1... Optical fiber bundle for light transmission, 2... Triangular deformed prism.

Claims (1)

[Claim for Utility Model Registration] 1. Optical fiber bundle for light transmission on the light entrance surface of a triangular deformed prism whose light entrance surface is tilted by the angle of diffusion of the emitted diffused light or an angle close to it. An illumination device for an endoscope, characterized in that its tip is formed diagonally so that the end faces meet and are brought into close contact. 2. An illumination device for an endoscope according to claim 1, in which the reflective surface of the triangularly deformed prism is curved.